Beginning from WinRAR 3.50, DOS SFX module is available only in RAR/DOS32 distributive. If you wish to create DOS self-extracting archives, you need to extract default.sfx file from RAR/DOS32 distributive, rename it to DOS.SFX and place it to WinRAR folder.
Using this module you may create self-extracting archives, which can be extracted in text mode under DOS. DOS SFX module can also work in a DOS box under OS/2, Windows and other OS in DOS emulation mode.
DOS.SFX supports the following command line switches:
-x Extract from archive (default action)
-t Test archive files
-v Verbosely list contents of archive
-? Show help